Petrographic image of metagabbro rock, NOCA 35690c
Circular microscopic image of rock structure.
Microscopic image of a thin section of metavolcanic rock collected by Peter Misch high on Winchester Lookout Trail in 1961. One of five images. See also NOCA 35691. (Peter Misch Geology Collection, North Cascades NPS Complex Museum Collection.)
U.S. National Park Service
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